Using the Cypress PSoC Processor - Seattle Robotics Society

Using the Cypress PSoC Processor

January 15, 2011 Lloyd Moore President/Owner, CyberData Corporation

Overview „ „ „ „ „ „ „ „

Programmable Systems On Chip Cypress Family PSoC 3/5 Architectural Overview Configurable Components Development Environment Cool Peripherals For Robotics Best Practices Resources

Programmable Systems on Chip „

Single chip contains: „ „ „ „ „

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Traditional processor Traditional peripherals CPLD/FPGA hardware Analog hardware Programmable analog hardware

Primary advantages are reduced part count, reduced cost, increased flexibility and increased reliability Several now on the market „ „ „

Actel SmartFusion Xilinx Cypress PSoC

Cypress PSoC Family „

PSoC 1 „ „ „

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Power PSoC „ „

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Redesign of development tool chain Redesign of analog blocks Enhanced 8051 core, 33 MIPS Production parts available December 2010

PSoC 5 „ „ „

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Simple devices, for LED lighting and motor control Have high current FETs on board (1A range)

PSoC 3 „

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The original design 8 bit M8C core, 4 MIPS Available since 2001

Same base architecture as PSoC 3 + 2 additional SAR ADCs 32 bit ARM Cortex M3 core, 100 Dhrystone MIPS Sampling now, production parts Q2 2011

Will be talking only about the PSoC 3 & 5 today

Cypress PSoC Family „

Programmable in ‘C’ or assembly „

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‘C’ is the default / recommended language

Low cost of entry „ „

$50 to $250 for development kits Development tools are a free download „ „ „

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PSoC Creator PSoC Programmer C – Compiler (Keil for PSoC3, GCC for PSoC5)

Good balance of processor, analog blocks and digital blocks Single chip solution for many designs Can start with the PSoC 3 and easily migrate to PSoC 5 when available / needed „ „ „

Plan for this in your design to make it smooth Only a recompile needed in many cases CANNOT migrate to/from PSoC 1

PSoC 3 & 5 Architecture

Universal Digital Blocks

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Each block contains 2 PLD blocks The Datapath is a programmable ALU „ „ „ „

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PLD usage can be decoupled from Datapath „ „

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8 bit single cycle ALU with shift and mask operations 2 Accumulators 2 Data registers 2 FIFO banks (4 bytes deep) Allows for more efficient resource mappings Cross individual block boundaries

PLD and Datapath blocks can be chained for 16-32 bit operations

UDB Uses „ „ „ „ „ „ „ „ „

Counters Timers PWM UART Combinational discrete logic Pseudo random number generator Quadrature Encoder CRC Many, many others

SC/CT Blocks

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Basically an op-amp core with programmable resistors and capacitors attached Used for building „ „ „

More op-amps!, Programmable gain amplifiers Transimpedance amps, Mixers Sample and hold amplifiers

Prebuilt Components „ „ „

Hardware components normally combined to make what you need for your application Large library of prebuilt components available Each component consists of „ „ „ „ „

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Hardware specification (Graphical or VHDL) Schematic symbol for graphical editor ‘C’ API Datasheet Custom configuration dialog

Extensive abilities to also create your own components „ „ „ „

VHDL or graphical design for hardware description PDF for the datasheet .NET for configuration dialog Complete SDK in the tool chain for building these

Development Environment „

PSoC Creator – Full IDE „ „ „

Pretty similar to Visual Studio or Eclipse Hardware aspects programmed with a schematic capture style tool Integrated programmer / debugger

CapSense Module „

Very flexible architecture Individual buttons, matrix of buttons „ Linear sliders, radial sliders „ Full touch pads „ Proximity sensors „

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Works with most materials, not just fingers!

Manual and automatic tuning „

GUI tuning application to assist

LCD Module „

Modes: „ „ „

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Character Graphic Segment

Character LCD VERY helpful for debugging even if not needed for application „ „

Very simple API, base data types supported Can upgrade default LCD in dev kit „

Lumex family of character displays, 4/8 bit parallel interface

Boost Converter „

Input from 0.5V to 5.5V „

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Allows for input from a solar cell / energy harvesting

Requires an external inductor, capacitor and optional diode Source up to 30mA with internal diode, 50mA with external diode Can also be used to form a regulated power supply not used by the processor

Best Practices „

Develop the hardware layer first „

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Will automatically generate API for you

Implement timing critical functions in hardware, complex functions in software Use provided APIs and macros „ „

Allows for component upgrades automatically Allows for conversion of projects between PSoC3 and PSoC5 with minimal changes „

Also different processors in the same family

More Best Practices „ „

Reserve and use “debug pins” to access internal signals Keep digital and analog signals separate „ „

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Use dedicated pins for internal op-amps „

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Analog domain clocks available Processor die split, orient this with board layout Reduced silicon switch resistance

Buffer analog signals „

Most internal sources have very minimal drive capability

And MORE Best Practices „

Watch for hardware race conditions „ „ „

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Read and know the items on the errata sheets! „

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Use a higher frequency clock and “sequencer block” to control complex sequential logic Many resets and presets require a clock cycle to take effect May look like it works, but happening “by chance” Development tools can also adjust for errata items

Reserve time for experimentation „ „ „ „

MANY ways to do things on this processor Power of the processor comes from flexibility Distinction between hardware and software largely gone Combining hardware and software approach often the cleanest and simplest solution

Summary „

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The PSoC processor integrates programmable analog and digital with a traditional processing core The PSoC can be a one chip solution for many robotics projects Develop the hardware configuration first and then develop the software, leaving time to experiment with different configurations

Resources „

PSoC Product Web Site: „

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PSoC Developer Community: „

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http://www.cypress.com/?rID=43674

PSoC Full Development Kit (1, 3, 5): $249 „

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http://www.cypress.com/training

PSoC 5 FirstTouch Starter Kit: $50 „

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http://www.psocdeveloper.com/forums/

PSoC Training On Demand: „

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http://www.cypress.com/?id=1353

http://www.cypress.com/?rID=37464

My Contact Info: „ „

[email protected] http://www.CyberData-Robotics.com

Questions???? „ „

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IDE demo if time Will be around a bit after the meeting for individual questions Feel free to e-mail me